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High-performance descriptor for magnetic materials: Accurate discrimination of magnetic structure

Physical Review B 2023年第1期108卷 014403-014403页

作者： Michi-To Suzuki Takuya Nomoto Eiaki V. Morooka Yuki Yanagi Hiroaki Kusunose Center for Computational Materials Science Institute for Materials Research Tohoku University Sendai Miyagi 980-8577 Japan Center for Spintronics Research Network Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Research Center for Advanced Science and Technology University of Tokyo Komaba Meguro-ku Tokyo 153-8904 Japan Department of Applied Physics Aalto University P.O. Box 11100 00076 Aalto Espoo Finland Liberal Arts and Sciences Toyama Prefectural University Imizu Toyama 939-0398 Japan Department of Physics Meiji University Kawasaki 214-8571 Japan Quantum Research Center for Chirality Institute for Molecular Science Okazaki 444-8585 Japan

The magnetic structure is crucial in determining the physical properties inherent in magnetic compounds. We present an adequate descriptor for magnetic structure with proper magnetic symmetry and high discrimination performance, which does not depend on artificial choices for coordinate origin, axis, and magnetic unit cell in crystal. We extend the formalism called “smooth overlap of atomic positions” (SOAP), providing a numerical representation of atomic configurations to that of magnetic moment configurations. We introduce the descriptor in terms of the vector spherical harmonics to describe a magnetic moment configuration and partial spectra from the expansion coefficients. We discuss that the lowest-order partial spectrum is insufficient to discriminate the magnetic structures with different magnetic anisotropy, and a higher-order partial spectrum is required in general to differentiate detailed magnetic structures on the same atomic configuration. We then introduce the fourth-order partial spectrum and evaluate the discrimination performance for different magnetic structures, mainly focusing on the difference in magnetic symmetry. The modified partial spectra that are defined not to reflect the difference of magnetic anisotropy are also useful in evaluating magnetic structures obtained from the first-principles calculations performed without spin-orbit coupling. We apply the present method to the symmetry-classified magnetic structures for the crystals of Mn3Ir and Mn3Sn, which are known to exhibit anomalous transport under the antiferromagnetic order, and examine the discrimination performance of the descriptor for different magnetic structures on the same crystal.

关键词： Magnetic order Magnetism Spin-orbit coupling

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Symmetry-Based Phenomenological Model for Magnon Transport in a Multiferroic

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Physical Review Letters 2025年第1期134卷 016703-016703页

作者： Isaac A. Harris Sajid Husain Peter Meisenheimer Maya Ramesh Hyeon Woo Park Lucas Caretta Darrell G. Schlom Zhi Yao Lane W. Martin Department of Physics University of California Berkeley California USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California USA Department of Materials Science and Engineering University of California Berkeley California USA Department of Materials Science and Engineering Cornell University Ithaca New York USA Department of Physics Korea Advanced Institute of Science and Technology Daejon Korea School of Engineering Brown University Providence Rhode Island USA Kavli Institute at Cornell for Nanoscale Science Ithaca New York 14853 USA Leibniz-Institut für Kristallzüchtung Max-Born-Straße 2 12489 Berlin Germany Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Materials Science and NanoEngineering Rice University Houston Texas USA Department of Physics and Astronomy Rice University Houston Texas USA Department of Chemistry Rice University Houston Texas USA Rice Advanced Materials Institute Rice University Houston Texas USA

Magnons—carriers of spin information—can be controlled by electric fields in the multiferroic BiFeO3 (BFO), a milestone that brings magnons closer to application in future devices. The origin of magnon-spin currents in BFO, however, is not fully understood due to BFO’s complicated magnetic texture. In this Letter, we present a phenomenological model to elucidate the existence of magnon spin currents in generalized multiferroics by examining the symmetries inherent to their magnetic and polar structures. This model is grounded in experimental data obtained from BFO and its derivatives, which informs the symmetry operations and resultant magnon behavior. By doing so, we address the issue of symmetry-allowed, switchable magnon spin transport in multiferroics, thereby establishing a critical framework for comprehending magnon transport within complex magnetic textures.

关键词： Electric fields

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Integrated Optimization of Underwater Acoustic Ship-Radiated Noise Recognition Using Relative GMM-MAP-UBM Approach

Integrated Optimization of Underwater Acoustic Ship-Radiated...

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Innovation in technology (INOCON), IEEE International Conference for

作者： K Mamatha Oluwadare Joshua Oyebode Arul Mary Rexy V S. Kaliappan D. Suganthi U. Hemamalini Department of Mathematics Vardhaman College of Engineering (Autonomous) Hyderabad Telangana India Department of Civil and Environmental Engineering Afe Babalola University Ado-Ekiti Ekiti State Nigeria Saveetha College of Liberal Arts and Sciences SIMATS Chennai India Division of Research and Development Lovely Professional University Jalandhar – Delhi Phagwara Punjab India Department of Computational Intelligence Saveetha College of Liberal Arts and Sciences SIMATS Chennai India Department of Information Technology Vels Institute of Science Technology & Advanced Studies (VISTAS) Chennai India

Due to the wealth of information it contains, ship radiated noise plays a crucial role in underwater acoustic signal processing for ship identification. The traditional approach to ship radiated noise detection is extremely inefficient and inaccurate since it relies excessively on the operator's prior knowledge and experience. While doing preprocessing, feature extraction, and training the model, make sure to keep the order of significance. The application of frequency component decomposition drives data preparation. researchers examine a wide variety of feature extraction approaches for application in ship-radiated noise detection, classifying the resulting features accordingly. Following feature extraction, with unified GMM-MAP-UBM models must be trained. Both GMM and UBM, which are considered state-of-the-art approaches, are surpassed by the proposed method. An improvement of 98.54% in accuracy was achieved after implementing the technique.

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Charge equilibration of Laser-accelerated Carbon Ions in Foam Target

arXiv

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arXiv 2023年

作者： Ma, Bubo Ren, Jieru Liu, Lirong Wei, Wenqing Chen, Benzheng Zhang, Shizheng Xu, Hao Hu, Zhongmin Li, Fangfang Wang, Xing Yin, Shuai Feng, Jianhua Zhou, Xianming Gao, Yifang Li, Yuan Shi, Xiaohua Li, Jianxing Ren, Xueguang Xu, Zhongfeng Deng, Zhigang Qi, Wei Wang, Shaoyi Fan, Quanping Cui, Bo Wang, Weiwu Yuan, Zongqiang Teng, Jian Wu, Yuchi Cao, Zhurong Zhao, Zongqing Gu, Yuqiu Cao, Leifeng Zhu, Shaoping Cheng, Rui Lei, Yu Wang, Zhao Zhou, Zexian Xiao, Guoqing Zhao, Hongwei Hoffmann, Dieter H.H. Zhou, Weimin Zhao, Yongtao MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Science Xi’an Jiaotong University Xi’an710049 China Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang621900 China Advanced Materials Testing Technology Research Center Shenzhen University of Technology Shenzhen518118 China Institute of Applied Physics and Computational Mathematics Beijing100094 China Graduate School China Academy of Engineering Physics Beijing100088 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou710049 China

The charge equilibration of laser-accelerated carbon ion beams in 2 mg/cm3 foam target was investigated experimentally. The ions were generated through target normal sheath acceleration mechanism in laser-foil interaction scheme. This allows to get the equilibrium charge state in wide energy range near Bragg peak within a single shot. By using foam, the charge equilibration measurement in density regime between gas and solid state was firstly reached out experimentally. It was found that the theoretical predictions with tabulated cross section data for gas target greatly underestimated the charge states. The experimental data are in close agreement with both semi-empirical formula as well as rate equation predictions based on ion-solid interactions. The important role of target density effects that increase the ionization probability and decrease the electron capture probability through frequent multi-collisions in foam are demonstrated. The double electron processes are shown to have little influence on the average charge states. The findings are essential for high energy density physics research where the foams are widely used, and have impacts on a broad range of applications in medical, biological and material fields. The method also provides a new approach to investigate the interaction mechanism of swift heavy ions in matter by taking advantage of the laser-accelerated short-pulse wide-energy range ions. © 2023, CC BY.

关键词： Carbon

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Correction: Modeling of concrete-filled PVC tube columns confined with CFRP strips under uniaxial eccentric compression: machine learning and finite element approaches

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Journal of Big Data 2025年第1期12卷 1-2页

作者： Wang, Yan Elmeligy, Mohamed A. Isleem, Haytham F. Hamed, Asmaa Y. Qader, Diyar N. Sharaf, Mohamed Jangir, Pradeep Arpita Tejani, Ghanshyam G. School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin China Advanced Manufacturing Institute King Saud University Riyadh Saudi Arabia Jadara University Research Center Jadara University Irbid Jordan Department of Computer Science University of York York UK Construction and Building Department The Higher Institute of Engineering and Technology Luxor Luxor Egypt Civil Engineering Department University of Kirkuk Kirkuk Iraq Industrial Engineering Department College of Engineering King Saud University Riyadh Saudi Arabia University Centre for Research and Development Chandigarh University Gharuan Mohali India Hourani Center for Applied Scientific Research Al-Ahliyya Amman University Amman Jordan Department of CSE Graphic Era Hill University Dehradun India Graphic Era Deemed Department of CSE To Be University Dehradun India Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India Department of Industrial Engineering and Management Yuan Ze University Taoyuan Taiwan Applied Science Research Center Applied Science Private University Amman Jordan

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Strong Polarization of a J=1/2 to 1/2 Transition Arising from Unexpectedly Large Quantum Interference

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Physical Review Letters 2023年第11期130卷 113001-113001页

作者： Nobuyuki Nakamura Naoki Numadate Simpei Oishi Xiao-Min Tong Xiang Gao Daiji Kato Hirokazu Odaka Tadayuki Takahashi Yutaka Tsuzuki Yuusuke Uchida Hirofumi Watanabe Shin Watanabe Hiroki Yoneda Institute for Laser Science The University of Electro-Communications Tokyo 182-8585 Japan Center for Computational Sciences University of Tsukuba Ibaraki 305-8573 Japan Institute for Applied Physics and Computational Mathematics Beijing 100088 China National Institute for Fusion Science Toki Gifu 509-5292 Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka 816-8580 Japan Department of Physics The University of Tokyo Tokyo 113-0033 Japan Kavli Institute for the Physics and Mathematics of the Universe (WPI) Institutes for Advanced Study (UTIAS) The University of Tokyo Chiba 277-8583 Japan Department of Physics School of Science and Technology Tokyo University of Science Chiba 278-8510 Japan Center of Applied Superconductivity and Sustainable Energy Research Chubu University Aichi 487-8501 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa 252-5210 Japan RIKEN Nishina Center Saitama 351-0198 Japan

We experimentally show that the 1s22s22p1/2−1s2s22p1/22 transition in Pb77+ emitted in dielectronic recombination of Pb78+ is strongly polarized, although it is an intrinsically unpolarized J=1/2 to 1/2 transition. This unanticipated polarization is shown to be due to quantum interference with radiative recombination. The interference effect has been studied on an asymmetric resonance profile but has never been studied on polarization. In this Letter, we show that the effect on polarization can arise from a different cross term than that responsible for asymmetry, resulting in unexpectedly large polarization even for a nearly symmetric resonance suggesting a small interference.

关键词： Relativistic & quantum electrodynamic effects in atoms, molecules,& ions Relativistic heavy-ion collisions Ions Polarization

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Degree distributions under general node removal: Power-law or Poisson?

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Physical Review E 2022年第6期106卷 064309-064309页

作者： Mi Jin Lee (이미진) Jung-Ho Kim (김정호) Kwang-Il Goh (고광일) Sang Hoon Lee (이상훈) Seung-Woo Son (손승우) Deok-Sun Lee (이덕선) Department of Applied Physics Hanyang University Ansan 15588 Korea Department of Physics Korea University Seoul 02841 Korea Department of Physics and Research Institute of Natural Science Gyeongsang National University Jinju 52828 Korea Future Convergence Technology Research Institute Gyeongsang National University Jinju 52849 Korea School of Computational Sciences and Center for AI and Natural Sciences Korea Institute for Advanced Study Seoul 02455 Korea

Perturbations made to networked systems may result in partial structural loss, such as a blackout in a power-grid system. Investigating the resulting disturbance in network properties is quintessential to understand real networks in action. The removal of nodes is a representative disturbance, but previous studies are seemingly contrasting about its effect on arguably the most fundamental network statistic, the degree distribution. The key question is about the functional form of the degree distributions that can be altered during node removal or sampling. The functional form is decisive in the remaining subnetwork's static and dynamical properties. In this work, we clarify the situation by utilizing the relative entropies with respect to the reference distributions in the Poisson and power-law form, to quantify the distance between the subnetwork's degree distribution and either of the reference distributions. Introducing general sequential node removal processes with continuously different levels of hub protection to encompass a series of scenarios including uniform random removal and preferred or protective (i.e., biased random) removal of the hub, we classify the altered degree distributions starting from various power-law forms by comparing two relative entropy values. From the extensive investigation in various scenarios based on direct node-removal simulations and by solving the rate equation of degree distributions, we discover in the parameter space two distinct regimes, one where the degree distribution is closer to the power-law reference distribution and the other closer to the Poisson distribution.

关键词： Degree distributions Robustness Scale free & inhomogeneous networks

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Substrate temperature effects on PEALD HfAlO dielectric films for IGZO-TFT applications

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applied Surface science 2024年 665卷

作者： Chen, Han-Bin Hsu, Chia-Hsun Wu, Wan-Yu Zhang, Wen-Zhi Zhang, Jing Zhang, Xiao-Ying Gao, Peng Wuu, Dong-Sing Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology China The School of Opto-electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen361024 China Department of Materials Science and Engineering National United University Miaoli360302 Taiwan Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

Aluminum incorporated hafnium oxide (HfAlO) has garnered significant attention due to its high dielectric constant. The present study employs supercycle plasma-enhanced atomic layer deposition (PEALD) to prepare HfAlO films, switching between HfO2 and Al2O3 deposition. The effects of substate temperature on the HfAlO films are systematically investigated. The experimental results indicate that increased substrate temperatures favor Al2O3 growth on HfO2, but excessively high temperatures result in deviated PEALD growth and deteriorated film properties. The PEALD window can be reached at substrate temperatures of 300 to 350 °C. The Al content is substantially affected by the substrate temperature, despite a constant Al2O3 PEALD cycle ratio used. The film deposited at 350 °C exhibits the highest Al content, density, and (1 1 1) crystalline orientation ratio, leading to a high breakdown field of 6 MV/cm and a considerable dielectric constant of 27. The HfAlO films are applied to indium gallium zinc oxide transistor as the dielectric layer, and the 350 °C-deposited HfAlO leads to the best device performance with a remarkably high on/off current ratio of 3.5 × 109, low threshold voltage of −0.1 V, saturated mobility of 6.1 cm2 V−1 s−1, and a low subthreshold swing of 76 mV/dec. © 2024 Elsevier B.V.

关键词： Thin film transistors

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Thermally Radiative Casson Fluid Flow over a Cylinder with Newtonian Heating and Heat generation/absorption 1

Thermally Radiative Casson Fluid Flow over a Cylinder with N...

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1st International Conference on Advances in computational science and Engineering, ICACSE 2020

作者： Loganathan, K. Sivakumar, M. Mohanraj, M. Sakthivel, P. Research and Development Wing Live4Research Tamil Nadu Tiruppur638 106 India Department of Applied Mathematics and Computational Science PSG College of Technology Tamil Nadu Coimbatore641 004 India Department of Mechanical Engineering Hindusthan College of Engineering and Technology Tamil Nadu Coimbatore641 032 India Department of Physics Faculty of Engineering Karpagam Academy of Higher Education Tamil Nadu Coimbatore641 021 India

This communication explains the impact of thermally radiative flow of a Casson fluid over a cylinder with velocity slip, suction/injection, and Newtonian heating condition. The governing PDE expressions are remodeled into an ODE expressing by applying suitable variables. The homotopy analysis (HAM) technique was implemented for solving our models. The impact of velocity field, temperature distribution, skin friction coefficient, Nusselt number in terms of diverse physical parameters like Casson parameter, suction/injection parameter, Newtonian heating parameter, radiation parameters, heat generation/absorption, Hartmann number and velocity slip parameter. The Hartmann number leads to slow down the fluid velocity, skin friction coefficient and local Nusselt number. The slip parameter decreases the fluid velocity and enhance the fluid heat transfer gradient. © Published under licence by IOP Publishing Ltd.

关键词： Nusselt number

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Onset of inverse magnetic energy transfer in collisionless turbulent plasmas

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Physical Review E 2021年第2期104卷 025204-025204页

作者： Z. H. Zhao Y. Xie Z. Lei J. L. Jiao W. M. Zhou C. T. Zhou S. P. Zhu X. T. He B. Qiao Center for Applied Physics and Technology HEDPS and SKLNPT School of Physics Peking University Beijing 100871 China Science and Technology on Plasma Physics Laboratory Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 China Center for Advanced Material Diagnostic Technology Shenzhen Technology University Shenzhen 518118 China Institute of Applied Physics and Computational Mathematics Beijing 100094 China

Inverse magnetic energy transfer from small to large scales is a key physical process for the origin of large-scale strong magnetic fields in the universe. However, so far, from the magnetohydrodynamic perspective, the onset of inverse transfer is still not fully understood, especially the underlying dynamics. Here, we use both two-dimensional and three-dimensional particle-in-cell simulations to show the self-consistent dynamics of inverse transfer in collisionless decaying turbulent plasmas. Using the space filtering technique in theory and numerical analyses, we identify magnetic reconnection as the onset and fundamental drive for inverse transfer, where, specifically, the subscale electromotive force driven by magnetic reconnection do work on the large-scale magnetic field, resulting in energy transfer from small to large scales. The mechanism is also verified by the strong correlations in locations and characteristic scales between inverse transfer and magnetic reconnection.

关键词： High-energy-density plasmas Magnetic field generation & plasma dynamo Magnetohydrodynamic turbulence Plasma turbulence Space & astrophysical plasma Particle-in-cell methods Plasma kinetic theory

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